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Introduction
6. Operating Principle
1) Refrigerant System Diagram
1. Cooling
Refrigerant (R410A) coming out of the compressors flows into the outdoor heat exchanger after passing
through the oil separator and the reversing valve. Then heat is dissipated by the outside air, the refrigerant
condenses into a liquid, eventually entering an overcooled status in the subcooling heat exchanger.
The overcooled refrigerant then flows through the pipe to the indoor electronic expansion valve where the
refrigerant reduces its pressure.
Then the refrigerant flows into the indoor heat exchanger where it is evaporated by absorbing the indoor heat
and continues through the reversing valve and the accumulator before returning to the compressors.
 8 TON
AOT Accumulator outlet temperature sensor PSH1 Refrigerant high pressure sensor 1
C/P S Compressor intake temperature sensor PSL Refrigerant low pressure sensor
C/P T1
Compressor discharge pipe temperature
sensor 1
SOT
Sub heat exchanger liquid temperature
sensor
C/P T2
Compressor discharge pipe temperature
sensor 2
THG
Outdoor heat exchanger vapor tempera-
ture sensor
HLSW1 Refrigerant high pressure switch 1 THL
Outdoor heat exchanger liquid tempera-
ture sensor
ILT Outdoor liquid pipe temperature sensor THO Outside air temperature sensor
Outdoor heat exchanger
THO
THG
Sub heat exchanger
THL
Check valve for liquid pipe
Fusible plug
Strainer (for liquid)
Sub heat exchanger
liquid flow control valve
SOT
Reversing valve
Hot gas bypass valve
PSH1
HLSW1
Buffer
Oil separator
High pressure service port
Dryer filter
Oil bypass control valve
Strainer
(for vapor)
Electromagnetic compressor
capacity valve 1
C/P T2
C/P T1
C/P2
C/P1
The compressor capacity control valve
bypasses the refrigerant to reduce the refrigerant
amount in the refrigerant system during
low-load operation.
AOT
C/P S
Low pressure service port
P
S
L
Accumulator
Strainer (for vapor)
Strainer (for liquid)
ILT
Stop valve (for liquid)
Stop valve (for vapor)
Supercooling
heat exchanger
Supercooling
valve
Strainer
(for liquid)
Electronic expansion valve
Indoor heat exchanger liquid
pipe temperature sensor
Intake air temperature sensor
Indoor heat exchanger
Indoor heat exchanger vapor pipe
temperature sensor
shows the refrigerant flow direction
Electromagnetic compressor
capacity valve 2
Outdoor heat exchanger
liquid flow control valve
Fusible plug
C/P : Compressor
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